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        <h1 class="title">Babel 6 松散模式</h1>
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            <ol class="post-toc"><li class="post-toc-item post-toc-level-1"><a class="post-toc-link" href="#Babel-6-松散模式"><span class="post-toc-number">1.</span> <span class="post-toc-text">Babel 6 松散模式</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#两种模式"><span class="post-toc-number">1.1.</span> <span class="post-toc-text">两种模式</span></a></li><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#配置方式"><span class="post-toc-number">1.2.</span> <span class="post-toc-text">配置方式</span></a></li><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#转换结果比较"><span class="post-toc-number">1.3.</span> <span class="post-toc-text">转换结果比较</span></a></li><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#其它"><span class="post-toc-number">1.4.</span> <span class="post-toc-text">其它</span></a></li></ol></li></ol>
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<article id="post-babel6-loose-mode" class="post-article article-type-post fade" itemprop="blogPost">

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        <h1 class="post-card-title">Babel 6 松散模式</h1>
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            <time class="post-time" title="2019-07-30 19:00:00" datetime="2019-07-30T11:00:00.000Z" itemprop="datePublished">2019-07-30</time>

            
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            <h1 id="Babel-6-松散模式"><a href="#Babel-6-松散模式" class="headerlink" title="Babel 6 松散模式"></a>Babel 6 松散模式</h1><blockquote>
<p>英文原文：<a href="https://2ality.com/2015/12/babel6-loose-mode.html" target="_blank" rel="noopener">https://2ality.com/2015/12/babel6-loose-mode.html</a></p>
<p>作者：<a href="https://csspod.com/author/minwe/" target="_blank" rel="noopener">minwe</a></p>
<p>中文：<a href="https://csspod.com/babel6-loose-mode/" target="_blank" rel="noopener">https://csspod.com/babel6-loose-mode/</a></p>
</blockquote>
<p>想必每个写 JavaScript 的都或多或少了解过 ES5 引入的<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode" target="_blank" rel="noopener">严格模式</a>，Babel 6 在把 ES6+ 代码转换为 ES5 时，也提供了「松散模式」（loose mode）的选项。Babel 的松散模式和 ES5 没有任何关系，这里提 ES5 严格模式只是在概念上作一个比对，方便理解 Babel 的松散模式。</p>
<h2 id="两种模式"><a href="#两种模式" class="headerlink" title="两种模式"></a>两种模式</h2><p>一些 Babel 插件有两种工作模式：</p>
<ul>
<li><strong>标准模式</strong>：转换时尽可能遵循、接近 ES6 语义。</li>
<li><strong>松散模式</strong>：转换为简单的 ES5 实现。</li>
</ul>
<p>松散模式的优、缺点显而易见：</p>
<ul>
<li><strong>优点</strong>：转换出来的代码更简洁，没有为了接近 ES6 而添加的繁杂逻辑，文件更小，运行速度更快，兼容性更好。</li>
<li><strong>缺点</strong>：以后直接使用原生 ES6 时可能会遇到问题。需要留意。</li>
</ul>
<p>一般而言，不建议使用松散模式，不过也可以综合考虑项目的复杂程度，结合实际做选择。</p>
<h2 id="配置方式"><a href="#配置方式" class="headerlink" title="配置方式"></a>配置方式</h2><p>可以直接使用 <code>babel-preset-es2015-loose</code>：</p>
<figure class="highlight json"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">&#123;</span><br><span class="line"> <span class="attr">"presets"</span>: [</span><br><span class="line">   <span class="string">"es2015-loose"</span></span><br><span class="line">  ],</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>具体到某个插件时，可以设置 <code>loose</code> 参数为 <code>true</code>：</p>
<figure class="highlight"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">&#123;</span><br><span class="line">  <span class="attr">"plugins"</span>: [</span><br><span class="line">    ["transform-es2015-classes", &#123;loose: true&#125;],</span><br><span class="line">    <span class="string">"transform-es2015-object-super"</span></span><br><span class="line">  ]</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h2 id="转换结果比较"><a href="#转换结果比较" class="headerlink" title="转换结果比较"></a>转换结果比较</h2><p>以下面的代码为例：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Person</span> </span>&#123;</span><br><span class="line">  <span class="keyword">constructor</span>(name) &#123;</span><br><span class="line">    <span class="keyword">this</span>.name = name;</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  sayHi() &#123;</span><br><span class="line">    <span class="keyword">return</span> <span class="string">`Hi, this is <span class="subst">$&#123;<span class="keyword">this</span>.name&#125;</span>`</span>;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p><code>.babelrc</code> 配置为标准模式时：</p>
<figure class="highlight json"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">&#123;</span><br><span class="line">  <span class="attr">"presets"</span>: [</span><br><span class="line">    <span class="string">"es2015"</span></span><br><span class="line">  ]</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>转换以后的代码为：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">"use strict"</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> _createClass = <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123; <span class="function"><span class="keyword">function</span> <span class="title">defineProperties</span>(<span class="params">target, props</span>) </span>&#123; <span class="keyword">for</span> (<span class="keyword">var</span> i = <span class="number">0</span>; i &lt; props.length; i++) &#123; <span class="keyword">var</span> descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || <span class="literal">false</span>; descriptor.configurable = <span class="literal">true</span>; <span class="keyword">if</span> (<span class="string">"value"</span> <span class="keyword">in</span> descriptor) descriptor.writable = <span class="literal">true</span>; <span class="built_in">Object</span>.defineProperty(target, descriptor.key, descriptor); &#125; &#125; <span class="keyword">return</span> <span class="function"><span class="keyword">function</span> (<span class="params">Constructor, protoProps, staticProps</span>) </span>&#123; <span class="keyword">if</span> (protoProps) defineProperties(Constructor.prototype, protoProps); <span class="keyword">if</span> (staticProps) defineProperties(Constructor, staticProps); <span class="keyword">return</span> Constructor; &#125;; &#125;();</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">_classCallCheck</span>(<span class="params">instance, Constructor</span>) </span>&#123; <span class="keyword">if</span> (!(instance <span class="keyword">instanceof</span> Constructor)) &#123; <span class="keyword">throw</span> <span class="keyword">new</span> <span class="built_in">TypeError</span>(<span class="string">"Cannot call a class as a function"</span>); &#125; &#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> Person = <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span><br><span class="line">  <span class="function"><span class="keyword">function</span> <span class="title">Person</span>(<span class="params">name</span>) </span>&#123;</span><br><span class="line">    _classCallCheck(<span class="keyword">this</span>, Person);</span><br><span class="line"></span><br><span class="line">    <span class="keyword">this</span>.name = name;</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  _createClass(Person, [&#123;</span><br><span class="line">    key: <span class="string">"sayHi"</span>,</span><br><span class="line">    value: <span class="function"><span class="keyword">function</span> <span class="title">sayHi</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line">      <span class="keyword">return</span> <span class="string">"Hi, this is "</span> + <span class="keyword">this</span>.name;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;]);</span><br><span class="line"></span><br><span class="line">  <span class="keyword">return</span> Person;</span><br><span class="line">&#125;();</span><br></pre></td></tr></table></figure>
<p>使用 loose preset 后：</p>
<figure class="highlight json"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">&#123;</span><br><span class="line">  <span class="attr">"presets"</span>: [</span><br><span class="line">    <span class="string">"es2015-loose"</span></span><br><span class="line">  ]</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>转换结果为：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">"use strict"</span>;</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">_classCallCheck</span>(<span class="params">instance, Constructor</span>) </span>&#123; <span class="keyword">if</span> (!(instance <span class="keyword">instanceof</span> Constructor)) &#123; <span class="keyword">throw</span> <span class="keyword">new</span> <span class="built_in">TypeError</span>(<span class="string">"Cannot call a class as a function"</span>); &#125; &#125;</span><br><span class="line"></span><br><span class="line"><span class="keyword">var</span> Person = <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span><br><span class="line">  <span class="function"><span class="keyword">function</span> <span class="title">Person</span>(<span class="params">name</span>) </span>&#123;</span><br><span class="line">    _classCallCheck(<span class="keyword">this</span>, Person);</span><br><span class="line"></span><br><span class="line">    <span class="keyword">this</span>.name = name;</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  Person.prototype.sayHi = <span class="function"><span class="keyword">function</span> <span class="title">sayHi</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line">    <span class="keyword">return</span> <span class="string">"Hi, this is "</span> + <span class="keyword">this</span>.name;</span><br><span class="line">  &#125;;</span><br><span class="line"></span><br><span class="line">  <span class="keyword">return</span> Person;</span><br><span class="line">&#125;();</span><br></pre></td></tr></table></figure>
<p>确实更像熟悉的 ES5 代码。</p>
<p>该如何选择，自己看着办咯。</p>
<h2 id="其它"><a href="#其它" class="headerlink" title="其它"></a>其它</h2><p><a href="https://fecoding.cn/2016/08/10/the-loose-mode-babel-6/" target="_blank" rel="noopener">https://fecoding.cn/2016/08/10/the-loose-mode-babel-6/</a></p>

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